io_pin_remap.h

#ifndef __IO_PIN_REMAP_H__
#define __IO_PIN_REMAP_H__

#include "Arduino.h"

#if defined(BOARD_HAS_PIN_REMAP) && !defined(BOARD_USES_HW_GPIO_NUMBERS)

// Pin remapping functions
int8_t digitalPinToGPIONumber(int8_t digitalPin);
int8_t gpioNumberToDigitalPin(int8_t gpioNumber);

// Apply pin remapping to API only when building libraries and user sketch
#ifndef ARDUINO_CORE_BUILD

// Override APIs requiring pin remapping

// cores/esp32/Arduino.h
#define pulseInLong(pin, args...) pulseInLong(digitalPinToGPIONumber(pin), args)
#define pulseIn(pin, args...)     pulseIn(digitalPinToGPIONumber(pin), args)
#define noTone(_pin)              noTone(digitalPinToGPIONumber(_pin))
#define tone(_pin, args...)       tone(digitalPinToGPIONumber(_pin), args)

// cores/esp32/esp32-hal.h
#define analogGetChannel(pin)            analogGetChannel(digitalPinToGPIONumber(pin))
#define analogWrite(pin, value)          analogWrite(digitalPinToGPIONumber(pin), value)
#define analogWriteFrequency(pin, freq)  analogWriteFrequency(digitalPinToGPIONumber(pin), freq)
#define analogWriteResolution(pin, bits) analogWriteResolution(digitalPinToGPIONumber(pin), bits)

// cores/esp32/esp32-hal-adc.h
#define analogRead(pin)                           analogRead(digitalPinToGPIONumber(pin))
#define analogReadMilliVolts(pin)                 analogReadMilliVolts(digitalPinToGPIONumber(pin))
#define analogSetPinAttenuation(pin, attenuation) analogSetPinAttenuation(digitalPinToGPIONumber(pin), attenuation)

// cores/esp32/esp32-hal-dac.h
#define dacDisable(pin)      dacDisable(digitalPinToGPIONumber(pin))
#define dacWrite(pin, value) dacWrite(digitalPinToGPIONumber(pin), value)

// cores/esp32/esp32-hal-gpio.h
#define analogChannelToDigitalPin(channel)      gpioNumberToDigitalPin(analogChannelToDigitalPin(channel))
#define digitalPinToAnalogChannel(pin)          digitalPinToAnalogChannel(digitalPinToGPIONumber(pin))
#define digitalPinToTouchChannel(pin)           digitalPinToTouchChannel(digitalPinToGPIONumber(pin))
#define digitalRead(pin)                        digitalRead(digitalPinToGPIONumber(pin))
#define attachInterruptArg(pin, fcn, arg, mode) attachInterruptArg(digitalPinToGPIONumber(pin), fcn, arg, mode)
#define attachInterrupt(pin, fcn, mode)         attachInterrupt(digitalPinToGPIONumber(pin), fcn, mode)
#define detachInterrupt(pin)                    detachInterrupt(digitalPinToGPIONumber(pin))
#define digitalWrite(pin, val)                  digitalWrite(digitalPinToGPIONumber(pin), val)
#define pinMode(pin, mode)                      pinMode(digitalPinToGPIONumber(pin), mode)

// cores/esp32/esp32-hal-i2c.h
#define i2cInit(i2c_num, sda, scl, clk_speed) i2cInit(i2c_num, digitalPinToGPIONumber(sda), digitalPinToGPIONumber(scl), clk_speed)

// cores/esp32/esp32-hal-i2c-slave.h
#define i2cSlaveInit(num, sda, scl, slaveID, frequency, rx_len, tx_len) \
  i2cSlaveInit(num, digitalPinToGPIONumber(sda), digitalPinToGPIONumber(scl), slaveID, frequency, rx_len, tx_len)

// cores/esp32/esp32-hal-ledc.h
#define ledcAttach(pin, freq, resolution)                 ledcAttach(digitalPinToGPIONumber(pin), freq, resolution)
#define ledcAttachChannel(pin, freq, resolution, channel) ledcAttachChannel(digitalPinToGPIONumber(pin), freq, resolution, channel)
#define ledcWrite(pin, duty)                              ledcWrite(digitalPinToGPIONumber(pin), duty)
#define ledcWriteTone(pin, freq)                          ledcWriteTone(digitalPinToGPIONumber(pin), freq)
#define ledcWriteNote(pin, note, octave)                  ledcWriteNote(digitalPinToGPIONumber(pin), note, octave)
#define ledcRead(pin)                                     ledcRead(digitalPinToGPIONumber(pin))
#define ledcReadFreq(pin)                                 ledcReadFreq(digitalPinToGPIONumber(pin))
#define ledcDetach(pin)                                   ledcDetach(digitalPinToGPIONumber(pin))
#define ledcChangeFrequency(pin, freq, resolution)        ledcChangeFrequency(digitalPinToGPIONumber(pin), freq, resolution)
#define ledcOutputInvert(pin, out_invert)                 ledcOutputInvert(digitalPinToGPIONumber(pin), out_invert)

#define ledcFade(pin, start_duty, target_duty, max_fade_time_ms) ledcFade(digitalPinToGPIONumber(pin), start_duty, target_duty, max_fade_time_ms)
#define ledcFadeWithInterrupt(pin, start_duty, target_duty, max_fade_time_ms, userFunc) \
  ledcFadeWithInterrupt(digitalPinToGPIONumber(pin), start_duty, target_duty, max_fade_time_ms, userFunc)
#define ledcFadeWithInterruptArg(pin, start_duty, target_duty, max_fade_time_ms, userFunc, arg) \
  ledcFadeWithInterruptArg(digitalPinToGPIONumber(pin), start_duty, target_duty, max_fade_time_ms, userFunc, arg)

// cores/esp32/esp32-hal-matrix.h
#define pinMatrixInAttach(pin, signal, inverted)                   pinMatrixInAttach(digitalPinToGPIONumber(pin), signal, inverted)
#define pinMatrixOutAttach(pin, function, invertOut, invertEnable) pinMatrixOutAttach(digitalPinToGPIONumber(pin), function, invertOut, invertEnable)
#define pinMatrixOutDetach(pin, invertOut, invertEnable)           pinMatrixOutDetach(digitalPinToGPIONumber(pin), invertOut, invertEnable)

// cores/esp32/esp32-hal-rgb-led.h
#define rgbLedWrite(pin, red_val, green_val, blue_val) rgbLedWrite(digitalPinToGPIONumber(pin), red_val, green_val, blue_val)

// cores/esp32/esp32-hal-rmt.h
#define rmtInit(pin, channel_direction, memsize, frequency_Hz) rmtInit(digitalPinToGPIONumber(pin), channel_direction, memsize, frequency_Hz)
#define rmtSetEOT(pin, EOT_Level)                              rmtSetEOT(digitalPinToGPIONumber(pin), EOT_Level)
#define rmtWrite(pin, data, num_rmt_symbols, timeout_ms)       rmtWrite(digitalPinToGPIONumber(pin), data, num_rmt_symbols, timeout_ms)
#define rmtWriteAsync(pin, data, num_rmt_symbols)              rmtWriteAsync(digitalPinToGPIONumber(pin), data, num_rmt_symbols)
#define rmtWriteLooping(pin, data, num_rmt_symbols)            rmtWriteLooping(digitalPinToGPIONumber(pin), data, num_rmt_symbols)
#define rmtTransmitCompleted(pin)                              rmtTransmitCompleted(digitalPinToGPIONumber(pin))
#define rmtRead(pin, data, num_rmt_symbols, timeout_ms)        rmtRead(digitalPinToGPIONumber(pin), data, num_rmt_symbols, timeout_ms)
#define rmtReadAsync(pin, data, num_rmt_symbols)               rmtReadAsync(digitalPinToGPIONumber(pin), data, num_rmt_symbols)
#define rmtReceiveCompleted(pin)                               rmtReceiveCompleted(digitalPinToGPIONumber(pin))
#define rmtSetRxMaxThreshold(pin, idle_thres_ticks)            rmtSetRxMaxThreshold(digitalPinToGPIONumber(pin), idle_thres_ticks)
#define rmtSetCarrier(pin, carrier_en, carrier_level, frequency_Hz, duty_percent) \
  rmtSetCarrier(digitalPinToGPIONumber(pin), carrier_en, carrier_level, frequency_Hz, duty_percent)
#define rmtSetRxMinThreshold(pin, filter_pulse_ticks) rmtSetRxMinThreshold(digitalPinToGPIONumber(pin), filter_pulse_ticks)
#define rmtDeinit(pin)                                rmtDeinit(digitalPinToGPIONumber(pin))

// cores/esp32/esp32-hal-sigmadelta.h
#define sigmaDeltaAttach(pin, freq) sigmaDeltaAttach(digitalPinToGPIONumber(pin), freq)
#define sigmaDeltaWrite(pin, duty)  sigmaDeltaWrite(digitalPinToGPIONumber(pin), duty)
#define sigmaDeltaDetach(pin)       sigmaDeltaDetach(digitalPinToGPIONumber(pin))

// cores/esp32/esp32-hal-spi.h
#define spiAttachSCK(spi, sck)       spiAttachSCK(spi, digitalPinToGPIONumber(sck))
#define spiAttachMISO(spi, miso)     spiAttachMISO(spi, digitalPinToGPIONumber(miso))
#define spiAttachMOSI(spi, mosi)     spiAttachMOSI(spi, digitalPinToGPIONumber(mosi))
#define spiAttachSS(spi, cs_num, ss) spiAttachSS(spi, cs_num, digitalPinToGPIONumber(ss))

// cores/esp32/esp32-hal-touch.h
#define touchInterruptGetLastStatus(pin)                       touchInterruptGetLastStatus(digitalPinToGPIONumber(pin))
#define touchRead(pin)                                         touchRead(digitalPinToGPIONumber(pin))
#define touchAttachInterruptArg(pin, userFunc, arg, threshold) touchAttachInterruptArg(digitalPinToGPIONumber(pin), userFunc, arg, threshold)
#define touchAttachInterrupt(pin, userFunc, threshold)         touchAttachInterrupt(digitalPinToGPIONumber(pin), userFunc, threshold)
#define touchDetachInterrupt(pin)                              touchDetachInterrupt(digitalPinToGPIONumber(pin))
#define touchSleepWakeUpEnable(pin, threshold)                 touchSleepWakeUpEnable(digitalPinToGPIONumber(pin), threshold)

// cores/esp32/esp32-hal-uart.h
#define uartBegin(uart_nr, baudrate, config, rxPin, txPin, rx_buffer_size, tx_buffer_size, inverted, rxfifo_full_thrhd)                                  \
  uartBegin(                                                                                                                                             \
    uart_nr, baudrate, config, digitalPinToGPIONumber(rxPin), digitalPinToGPIONumber(txPin), rx_buffer_size, tx_buffer_size, inverted, rxfifo_full_thrhd \
  )
#define uartSetPins(uart, rxPin, txPin, ctsPin, rtsPin) \
  uartSetPins(uart, digitalPinToGPIONumber(rxPin), digitalPinToGPIONumber(txPin), digitalPinToGPIONumber(ctsPin), digitalPinToGPIONumber(rtsPin))
#define uartDetachPins(uart, rxPin, txPin, ctsPin, rtsPin) \
  uartDetachPins(uart, digitalPinToGPIONumber(rxPin), digitalPinToGPIONumber(txPin), digitalPinToGPIONumber(ctsPin), digitalPinToGPIONumber(rtsPin))

#endif  // ARDUINO_CORE_BUILD

#else

// pin remapping disabled: use stubs
#define digitalPinToGPIONumber(digitalPin) (digitalPin)
#define gpioNumberToDigitalPin(gpioNumber) (gpioNumber)

#endif

#endif /* __GPIO_PIN_REMAP_H__ */